1145100 has 72 divisors (see below), whose sum is σ = 3624768. Its totient is φ = 276800.

The previous prime is 1145099. The next prime is 1145107. The reversal of 1145100 is 15411.

It is a happy number.

It is a super-2 number, since 2×1145100² = 2622508020000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (1145107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3127 + ... + 3473.

It is an arithmetic number, because the mean of its divisors is an integer number (50344).

2^1145100 is an apocalyptic number.

1145100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1145100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1812384).

1145100 is an abundant number, since it is smaller than the sum of its proper divisors (2479668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1145100 is a wasteful number, since it uses less digits than its factorization.

1145100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 1145100 is about 1070.0934538628. The cubic root of 1145100 is about 104.6199411887.

The spelling of 1145100 in words is "one million, one hundred forty-five thousand, one hundred".